On her way home from an all-night surveillance job, V.I. Warshawski is led by her dogs on a mad chase that ends when they discover a badly injured teen hiding in the rocks along Lake Michigan. The girl only regains consciousness long enough to utter one enigmatic word. V.I. helps bring her to a hospital, but not long after, she vanishes before anyone can discover her identity. As V.I. attempts to find her, the detective uncovers an ugly consortium of Chicago powerbrokers and mobsters who are prepared to kill the girl. And now V.I.'s own life is in jeopardy as well.